package com.hmdp.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {
    private static final long BEGIN_ITMERSTANP = 1640995200L;
    private static final int COUNT_BITS = 32;
    @Autowired
    private StringRedisTemplate stringRedisTemplate;
    public long nextId(String keyPrefix){
        //时间戳
        LocalDateTime now = LocalDateTime.now();
        long secondnow = now.toEpochSecond(ZoneOffset.UTC);
        long timestanp = secondnow-BEGIN_ITMERSTANP;
        //生成序列号
        //获取当前日期，精确到天
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        //使用redis的自增长生成序列号
      Long count =   stringRedisTemplate.opsForValue().increment("icr:"+keyPrefix+":"+date);
      return timestanp << COUNT_BITS | count;

    }
}
